Fixing typos in Mix.Task docs
Merge pull request #1365 from jwarwick/mix_doc_typos

Fixing typos in Mix.Task docs
Small clean up on parser file
Optimize `HashDict` to store pairs in a cons cell reducing storage per key by half
elixir.bat: accomodate for paths with spaces

Signed-off-by: José Valim <jose.valim@plataformatec.com.br>
Show exit messages in IEx
Merge pull request #1366 from ericmj/iex-show-exit

Show exit messages in IEx
Improve error report on unhandled ->
Clean up ExUnit.CaseTemplate to allow composition